High-quality multimodal imaging technology is widely used in the biomedical field. Because the traditional transparent ultrasound transducer is opaque, the optical axis has to be another bypass, leading to the problems such as large volume, low integration and insufficient signal to noise ratio of the imaging equipment. Therefore, a novel optically transparent transducer is proposed herein for ultrasound transceiving. In this design, the acoustic-electric conversion element is made of a 100-μm-thickness lithium niobate crystal. Transparent indium tin oxide conductive layers are deposited onto the top and bottom surfaces of the circular or square crystal. A customized round metal housing is used for protection and encapsulation, and the optical resin acts as the acoustic matching layer and backing. Experimental results show that the new ultrasound transducer has a wider frequency band up to 40 MHz and a shorter response, compared to the commonly used piezoelectric ceramic ultrasound transducers on the market. The ultrasound transducer has the obvious advantages of compact and portable structure, wideband transparency, high sensitivity and high-frequency response. The proposed approach demonstrates the potential for seamless integration of ultrasound, photoacoustic, fluorescence, and other multimodal imaging techniques, thereby effectively advancing the development of photoacoustic imaging technology in biomedical applications.
A new advanced suspended-core fiber sensor is proposed and demonstrated for ultrasonic detection. The free micro suspended-core fiber is fabricated by acid corrosion and fiber splicing. Significantly, two cascaded uniform fiber Bragg gratings are imprinted into the suspended-core fiber. The sensor response and spectrum stability are thus largely improved because of the using of two fiber grating reflectors for constructing a suspended-core interferometer. This paper shows the sensor fabrication in detail and presents contrastive analysis of the spectrum characteristics. Preliminary measurements are also carried out to verify the enhanced acoustic performance of the dual-FBG suspended-core fiber. The proposed sensor is a good candidate for high-fidelity ultrasonic detection in seismic physical modeling.
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